18256266 has 80 divisors (see below), whose sum is σ = 49553856. Its totient is φ = 4904064.

The previous prime is 18256243. The next prime is 18256267. The reversal of 18256266 is 66265281.

18256266 is a `hidden beast` number, since 1 + 8 + 25 + 626 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18256266.

It is not an unprimeable number, because it can be changed into a prime (18256267) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18805 + ... + 19751.

Almost surely, 2^18256266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18256266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24776928).

18256266 is an abundant number, since it is smaller than the sum of its proper divisors (31297590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18256266 is a wasteful number, since it uses less digits than its factorization.

18256266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 976 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 18256266 is about 4272.7351895478. The cubic root of 18256266 is about 263.3119999097.

The spelling of 18256266 in words is "eighteen million, two hundred fifty-six thousand, two hundred sixty-six".